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Audio playback during Video for Windows capture

Posted on 2001-08-07
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Last Modified: 2010-04-06
I'm using Video for Windows to display video capture preview, which works fine, but I can't seem to manage to play any sound.

I use capCreateCaptureWindow and capPreview to create the capture window used for preview.

Setting fCaptureAudio to TRUE with capCaptureGetSetup doesn't seem to do anything.
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Question by:Keijo
7 Comments
 
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Expert Comment

by:MarcG
ID: 6358994
maybe stupid question, but did you connect the video source to your sound card ? I've seen people forgetting this already ...
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Expert Comment

by:MarcG
ID: 6358997
with video source i mean sound out of your video source
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Author Comment

by:Keijo
ID: 6359016
Yeah, I connected the sound as well, the audio playback even works with the software that came with the card, so everything should be in order.
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Accepted Solution

by:
NopparatM earned 200 total points
ID: 6362325
For my it work!

procedure TForm1.StartAVIClick(Sender: TObject);
var CaptureParms : TCaptureParms;
begin
     if hWndC <> 0 then
        begin
           SendMessage(hwndC, WM_CAP_SET_PREVIEW, -1, 0);
           SendMessage(hwndC, WM_CAP_GET_SEQUENCE_SETUP, sizeof(TCaptureParms), LongInt(@CaptureParms));
           CaptureParms.dwRequestMicroSecPerFrame := 50000;
           CaptureParms.fCaptureAudio := True;
           SendMessage(hwndC, WM_CAP_SET_SEQUENCE_SETUP, sizeof(TCaptureParms), LongInt(@CaptureParms));
           SaveDialog1.DefaultExt := 'avi';
           SaveDialog1.Filter := 'AVI files (*.avi)|*.avi';
           if SaveDialog1.Execute then
              begin
                 CapturingAVI := true;
                 SendMessage(hWndC,WM_CAP_FILE_SET_CAPTURE_FILE,0,Longint(pchar(SaveDialog1.FileName)));
                 SendMessage(hWndC, WM_CAP_SEQUENCE, 0, 0);
              end;
        end;
end;

procedure TForm1.StopAVIClick(Sender: TObject);
begin
     if hWndC <> 0 then
        SendMessage(hWndC, WM_CAP_STOP, 0, 0);
end;
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Expert Comment

by:Aleq
ID: 6409256
Just check in the volume settings (start/programs/...) - in the recording mode if the correct input is active (eg. line-in).

regards
  Aleq
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